---
name: "seekgb.c"
section: "3"
platform: "linux"
package: "libg2c-dev"
version: "2.1.0-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/seekgb.c"
---

# seekgb.c(3)

Search a file for the next GRIB message.

## NAME

seekgb.c - Search a file for the next GRIB message.

## SYNOPSIS

`#include 'grib2_int.h'`\
 `#include <stdio.h>`\
 `#include <stdlib.h>`\

### Functions

void **seekgb** (FILE \*lugb, **g2int** iseek, **g2int** mseek, **g2int** \*lskip, **g2int** \*lgrib)\
 Search a file for the next GRIB Message.

## Detailed Description

Search a file for the next GRIB message.

**Author**

Stephen Gilbert

**Date**

2002-10-28

### Program History Log

Date   Programmer   Comments    2002-10-28   GILBERT   Modified from Iredell's skgb subroutine    2009-01-16   VUONG   Changed lskip to 4 instead of sizof(g2int)    2022-09-11   Hartnett   Added g2c\_seekgb() function.

Definition in file **seekgb.c**.

## Function Documentation

### void seekgb (FILE \* lugb, g2int iseek, g2int mseek, g2int \* lskip, g2int \* lgrib)

Search a file for the next GRIB Message. The search is done starting at byte offset iseek of the file referenced by lugb for mseek bytes at a time. If found, the starting position and length of the message are returned in lskip and lgrib, respectively. The search is terminated when an EOF or I/O error is encountered.

### Program History Log

Date   Programmer   Comments    2002-10-28   GILBERT   Modified from Iredell's skgb subroutine    2009-01-16   VUONG   Changed lskip to 4 instead of sizof(g2int)

**Parameters**

*lugb* FILE pointer for the file to search. File must be opened before this routine is called. \
 *iseek* The number of bytes in the file to skip before search. \
 *mseek* The maximum number of bytes to search at a time (must be at least 16, but larger numbers like 4092 will result in better perfomance). \
 *lskip* Pointer that gets the number of bytes to skip from the beggining of the file to where the GRIB message starts. \
 *lgrib* Pointer that gets the number of bytes in message (set to 0, if no message found).

**Author**

Stephen Gilbert

**Date**

2002-10-28

Definition at line **46** of file **seekgb.c**.

References **BYTE**, **gbit()**, and **LOG**.

Referenced by **g2c\_get\_msg()**.

## Author

Generated automatically by Doxygen for NCEPLIBS-g2c from the source code.